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Nucleation of Superconductivity in Thin Type-I Foils

P. Valko, M. R. Gomes, TA Girard

cond-mat.supr-conarXiv:cond-mat/0607734

Abstract

The nucleation of the superconductive phase in macroscopic type-I foils in a slow, continuously decreasing perpendicular magnetic field is observed to first occur at the field Hc3, and reinitiate at Hc2. The observed variation of Hc2 with temperature further yields Ginzburg-Landau parameters for the materials approximately a factor 2 below tabulations, consistent with previous determinations in small grains.

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